package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @FileName SetmealServiceImpl
 * @Description
 * @Author Sword
 * @date 2024-02-29
 **/

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 新增套餐
     *
     * @param setmealDto
     * @return
     */
    @Transactional
    @Override
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal,执行insert操作
        this.save(setmealDto);
        //保存套餐和菜品的关联信息,操作setmeal_dish,执行insert操作
        //获取setmealDto中的setmealDishes集合
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        //使用stream流的map流处理集合,对SetmealId赋值
        setmealDishes.stream().map(item -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        setmealDishService.saveBatch(setmealDishes);
    }

    /**
     * 批量删除套餐
     *
     * @param ids
     */
    @Transactional
    @Override
    public void removeWithDish(List<Long> ids) {
        //查询套餐状态,确定是否可以删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId, ids);
        queryWrapper.eq(Setmeal::getStatus, 1);

        int count = this.count(queryWrapper);

        if (count > 0) {
            //如果不能删除,抛出一个业务异常
            throw new CustomException("删除失败,该套餐正在售卖");
        }

        //如果可以删除,先删除套餐表中的数据--setmeal
        this.removeByIds(ids);

        //再删除关系表中的数据--setmeal_dish
        LambdaQueryWrapper<SetmealDish> setmealDishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealDishLambdaQueryWrapper.in(SetmealDish::getSetmealId, ids);
        setmealDishService.remove(setmealDishLambdaQueryWrapper);
    }

    /**
     * 根据套餐id查询菜品
     *
     * @param id
     * @return
     */
    @Override
    public SetmealDto getByIdWithDish(Long id) {
        //根据套餐id查询套餐
        Setmeal setmeal = this.getById(id);
        SetmealDto setmealDto = new SetmealDto();

        //对象拷贝
        BeanUtils.copyProperties(setmeal, setmealDto);

        //构建条件根据套餐id查询菜品
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId, id);
        List<SetmealDish> list = setmealDishService.list(queryWrapper);

        setmealDto.setSetmealDishes(list);

        return setmealDto;
    }

    /**
     * 修改套餐信息
     *
     * @param setmealDto
     */
    @Transactional
    @Override
    public void updateWithDish(SetmealDto setmealDto) {
        //更新setmeal表基本信息
        this.updateById(setmealDto);

        //清理当前套餐表对应的菜品数据 --setmeal_dish表的delete操作
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId, setmealDto.getId());
        setmealDishService.remove(queryWrapper);

        //再添加当前提交过来的菜品数据 --setmeal_dish表的insert操作
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();

        setmealDishes = setmealDishes.stream().map(item -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        setmealDishService.saveBatch(setmealDishes);
    }
}
